source/libsmb/clireadwrite.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client file read/write routines
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #define NO_SYSLOG
  22
  23 #include "includes.h"
  24
  25 /****************************************************************************
  26 Issue a single SMBread and don't wait for a reply.
  27 ****************************************************************************/
  28
  29 static BOOL cli_issue_read(struct cli_state *cli, int fnum, off_t offset,
  30                            size_t size, int i)
  31 {
  32         memset(cli->outbuf,'\0',smb_size);
  33         memset(cli->inbuf,'\0',smb_size);
  34
  35         set_message(cli->outbuf,10,0,True);
  36
  37         SCVAL(cli->outbuf,smb_com,SMBreadX);
  38         SSVAL(cli->outbuf,smb_tid,cli->cnum);
  39         cli_setup_packet(cli);
  40
  41         SCVAL(cli->outbuf,smb_vwv0,0xFF);
  42         SSVAL(cli->outbuf,smb_vwv2,fnum);
  43         SIVAL(cli->outbuf,smb_vwv3,offset);
  44         SSVAL(cli->outbuf,smb_vwv5,size);
  45         SSVAL(cli->outbuf,smb_vwv6,size);
  46         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
  47
  48         return cli_send_smb(cli);
  49 }
  50
  51 /****************************************************************************
  52   Read size bytes at offset offset using SMBreadX.
  53 ****************************************************************************/
  54
  55 ssize_t cli_read(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
  56 {
  57         char *p;
  58         int size2;
  59         int readsize;
  60         ssize_t total = 0;
  61
  62         if (size == 0)
  63                 return 0;
  64
  65         /*
  66          * Set readsize to the maximum size we can handle in one readX,
  67          * rounded down to a multiple of 1024.
  68          */
  69
  70         readsize = (cli->max_xmit - (smb_size+32)) & ~1023;
  71
  72         while (total < size) {
  73                 readsize = MIN(readsize, size-total);
  74
  75                 /* Issue a read and receive a reply */
  76
  77                 if (!cli_issue_read(cli, fnum, offset, readsize, 0))
  78                         return -1;
  79
  80                 if (!cli_receive_smb(cli))
  81                         return -1;
  82
  83                 /* Check for error.  Make sure to check for DOS and NT
  84                    errors. */
  85
  86                 if (cli_is_error(cli)) {
  87                         BOOL recoverable_error = False;
  88                         NTSTATUS status = NT_STATUS_OK;
  89                         uint8 eclass = 0;
  90                         uint32 ecode = 0;
  91
  92                         if (cli_is_nt_error(cli))
  93                                 status = cli_nt_error(cli);
  94                         else
  95                                 cli_dos_error(cli, &eclass, &ecode);
  96
  97                         /*
  98                          * ERRDOS ERRmoredata or STATUS_MORE_ENRTIES is a
  99                          * recoverable error, plus we have valid data in the
 100                          * packet so don't error out here.
 101                          */
 102
 103                         if ((eclass == ERRDOS && ecode == ERRmoredata) ||
 104                             NT_STATUS_V(status) == NT_STATUS_V(STATUS_MORE_ENTRIES))
 105                                 recoverable_error = True;
 106
 107                         if (!recoverable_error)
 108                                 return -1;
 109                 }
 110
 111                 size2 = SVAL(cli->inbuf, smb_vwv5);
 112
 113                 if (size2 > readsize) {
 114                         DEBUG(5,("server returned more than we wanted!\n"));
 115                         return -1;
 116                 } else if (size2 < 0) {
 117                         DEBUG(5,("read return < 0!\n"));
 118                         return -1;
 119                 }
 120
 121                 /* Copy data into buffer */
 122
 123                 p = smb_base(cli->inbuf) + SVAL(cli->inbuf,smb_vwv6);
 124                 memcpy(buf + total, p, size2);
 125
 126                 total += size2;
 127                 offset += size2;
 128
 129                 /*
 130                  * If the server returned less than we asked for we're at EOF.
 131                  */
 132
 133                 if (size2 < readsize)
 134                         break;
 135         }
 136
 137         return total;
 138 }
 139
 140 #if 0  /* relies on client_receive_smb(), now a static in libsmb/clientgen.c */
 141
 142 /* This call is INCOMPATIBLE with SMB signing.  If you remove the #if 0
 143    you must fix ensure you don't attempt to sign the packets - data
 144    *will* be currupted */
 145
 146 /****************************************************************************
 147 Issue a single SMBreadraw and don't wait for a reply.
 148 ****************************************************************************/
 149
 150 static BOOL cli_issue_readraw(struct cli_state *cli, int fnum, off_t offset,
 151                            size_t size, int i)
 152 {
 153
 154         if (!cli->sign_info.use_smb_signing) {
 155                 DEBUG(0, ("Cannot use readraw and SMB Signing\n"));
 156                 return False;
 157         }
 158
 159         memset(cli->outbuf,'\0',smb_size);
 160         memset(cli->inbuf,'\0',smb_size);
 161
 162         set_message(cli->outbuf,10,0,True);
 163
 164         SCVAL(cli->outbuf,smb_com,SMBreadbraw);
 165         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 166         cli_setup_packet(cli);
 167
 168         SSVAL(cli->outbuf,smb_vwv0,fnum);
 169         SIVAL(cli->outbuf,smb_vwv1,offset);
 170         SSVAL(cli->outbuf,smb_vwv2,size);
 171         SSVAL(cli->outbuf,smb_vwv3,size);
 172         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 173
 174         return cli_send_smb(cli);
 175 }
 176
 177 /****************************************************************************
 178  Tester for the readraw call.
 179 ****************************************************************************/
 180
 181 ssize_t cli_readraw(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
 182 {
 183         char *p;
 184         int size2;
 185         size_t readsize;
 186         ssize_t total = 0;
 187
 188         if (size == 0)
 189                 return 0;
 190
 191         /*
 192          * Set readsize to the maximum size we can handle in one readraw.
 193          */
 194
 195         readsize = 0xFFFF;
 196
 197         while (total < size) {
 198                 readsize = MIN(readsize, size-total);
 199
 200                 /* Issue a read and receive a reply */
 201
 202                 if (!cli_issue_readraw(cli, fnum, offset, readsize, 0))
 203                         return -1;
 204
 205                 if (!client_receive_smb(cli->fd, cli->inbuf, cli->timeout))
 206                         return -1;
 207
 208                 size2 = smb_len(cli->inbuf);
 209
 210                 if (size2 > readsize) {
 211                         DEBUG(5,("server returned more than we wanted!\n"));
 212                         return -1;
 213                 } else if (size2 < 0) {
 214                         DEBUG(5,("read return < 0!\n"));
 215                         return -1;
 216                 }
 217
 218                 /* Copy data into buffer */
 219
 220                 if (size2) {
 221                         p = cli->inbuf + 4;
 222                         memcpy(buf + total, p, size2);
 223                 }
 224
 225                 total += size2;
 226                 offset += size2;
 227
 228                 /*
 229                  * If the server returned less than we asked for we're at EOF.
 230                  */
 231
 232                 if (size2 < readsize)
 233                         break;
 234         }
 235
 236         return total;
 237 }
 238 #endif
 239 /****************************************************************************
 240 issue a single SMBwrite and don't wait for a reply
 241 ****************************************************************************/
 242
 243 static BOOL cli_issue_write(struct cli_state *cli, int fnum, off_t offset, uint16 mode, char *buf,
 244                             size_t size, int i)
 245 {
 246         char *p;
 247
 248         if (size > cli->bufsize) {
 249                 cli->outbuf = realloc(cli->outbuf, size + 1024);
 250                 cli->inbuf = realloc(cli->inbuf, size + 1024);
 251                 if (cli->outbuf == NULL || cli->inbuf == NULL)
 252                         return False;
 253                 cli->bufsize = size + 1024;
 254         }
 255
 256         memset(cli->outbuf,'\0',smb_size);
 257         memset(cli->inbuf,'\0',smb_size);
 258
 259         if (size > 0xFFFF)
 260                 set_message(cli->outbuf,14,0,True);
 261         else
 262                 set_message(cli->outbuf,12,0,True);
 263
 264         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 265         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 266         cli_setup_packet(cli);
 267
 268         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 269         SSVAL(cli->outbuf,smb_vwv2,fnum);
 270
 271         SIVAL(cli->outbuf,smb_vwv3,offset);
 272         SIVAL(cli->outbuf,smb_vwv5,(mode & 0x0008) ? 0xFFFFFFFF : 0);
 273         SSVAL(cli->outbuf,smb_vwv7,mode);
 274
 275         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 276         SSVAL(cli->outbuf,smb_vwv9,((size>>16)&1));
 277         SSVAL(cli->outbuf,smb_vwv10,size);
 278         SSVAL(cli->outbuf,smb_vwv11,
 279               smb_buf(cli->outbuf) - smb_base(cli->outbuf));
 280
 281         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11);
 282         memcpy(p, buf, size);
 283         cli_setup_bcc(cli, p+size);
 284
 285         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 286
 287         show_msg(cli->outbuf);
 288         return cli_send_smb(cli);
 289 }
 290
 291 /****************************************************************************
 292   write to a file
 293   write_mode: 0x0001 disallow write cacheing
 294               0x0002 return bytes remaining
 295               0x0004 use raw named pipe protocol
 296               0x0008 start of message mode named pipe protocol
 297 ****************************************************************************/
 298
 299 ssize_t cli_write(struct cli_state *cli,
 300                   int fnum, uint16 write_mode,
 301                   char *buf, off_t offset, size_t size)
 302 {
 303         int bwritten = 0;
 304         int issued = 0;
 305         int received = 0;
 306         int mpx = MAX(cli->max_mux-1, 1);
 307         int block = (cli->max_xmit - (smb_size+32)) & ~1023;
 308         int blocks = (size + (block-1)) / block;
 309
 310         while (received < blocks) {
 311
 312                 while ((issued - received < mpx) && (issued < blocks)) {
 313                         int bsent = issued * block;
 314                         int size1 = MIN(block, size - bsent);
 315
 316                         if (!cli_issue_write(cli, fnum, offset + bsent,
 317                                         write_mode,
 318                                         buf + bsent,
 319                                         size1, issued))
 320                                 return -1;
 321                         issued++;
 322                 }
 323
 324                 if (!cli_receive_smb(cli))
 325                         return bwritten;
 326
 327                 received++;
 328
 329                 if (cli_is_error(cli))
 330                         break;
 331
 332                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 333                 bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))>>16);
 334         }
 335
 336         while (received < issued && cli_receive_smb(cli))
 337                 received++;
 338
 339         return bwritten;
 340 }
 341
 342 /****************************************************************************
 343   write to a file using a SMBwrite and not bypassing 0 byte writes
 344 ****************************************************************************/
 345
 346 ssize_t cli_smbwrite(struct cli_state *cli,
 347                      int fnum, char *buf, off_t offset, size_t size1)
 348 {
 349         char *p;
 350         ssize_t total = 0;
 351
 352         do {
 353                 size_t size = MIN(size1, cli->max_xmit - 48);
 354
 355                 memset(cli->outbuf,'\0',smb_size);
 356                 memset(cli->inbuf,'\0',smb_size);
 357
 358                 set_message(cli->outbuf,5, 0,True);
 359
 360                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 361                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 362                 cli_setup_packet(cli);
 363
 364                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 365                 SSVAL(cli->outbuf,smb_vwv1,size);
 366                 SIVAL(cli->outbuf,smb_vwv2,offset);
 367                 SSVAL(cli->outbuf,smb_vwv4,0);
 368
 369                 p = smb_buf(cli->outbuf);
 370                 *p++ = 1;
 371                 SSVAL(p, 0, size); p += 2;
 372                 memcpy(p, buf, size); p += size;
 373
 374                 cli_setup_bcc(cli, p);
 375
 376                 if (!cli_send_smb(cli))
 377                         return -1;
 378
 379                 if (!cli_receive_smb(cli))
 380                         return -1;
 381
 382                 if (cli_is_error(cli))
 383                         return -1;
 384
 385                 size = SVAL(cli->inbuf,smb_vwv0);
 386                 if (size == 0)
 387                         break;
 388
 389                 size1 -= size;
 390                 total += size;
 391                 offset += size;
 392
 393         } while (size1);
 394
 395         return total;
 396 }